Questions tagged [hobbyist]

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2 answers
138 views

Can I use a 700V transistor with a 12V collector and base?

Please forgive any misunderstandings, as I am not an expert on electrical components. I am trying to build the following circuit: I need to be able to run 1.5A through the transistor. Can I use a ...
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0 votes
2 answers
82 views

Doing digital IoT and some analog circuits without an oscilloscope

In my free time, I do electronic stuff as a hobby (at least for now.) I don't own an oscilloscope or a fancy multimeter due to the terrible financial state of my country. I am in Iran. In some ...
1 vote
0 answers
49 views

Advice on first PCB - doppler sonar project

I have designed a schematic for a PCB for a doppler sonar project. The plan is to use a RPi 3B+ for some basic signal processing, an arduino to produce a 40 kHz wave via PWM which is filtered to ...
1 vote
2 answers
112 views

Using an SN74HC595 as a single-wire state machine

I have an SN74HC595 shift register, and I want to use it to replace a microcontroller to save space and cost, since a microcontroller isn't really needed in my application. The application is a system ...
0 votes
2 answers
71 views

Looking for 5mm discrete multi color LED [closed]

I want to make an electronic version of the Master Mind game as a hobby project. The challenge at the moment is to find right type of LEDs for the job. Below you ...
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-1 votes
3 answers
114 views

Do 1MHz 3.3V through-hole oscillators exist?

I'm beginning my first MCU project and I'm having trouble finding a suitable oscillator. I want to run an ATtiny261 at very low power. It will be lighting up different combinations of LEDs based on ...
  • 101
0 votes
2 answers
108 views

Measure if bottle level is empty

Consider an upside bottle with liquid (water) oozing out from pinhole on head. I need to detect if water falls below a certain level. I searched and saw there are multiple sensors already available ...
14 votes
6 answers
1k views

Can I get help troubleshooting a simple hobby electronics circuit? Multimeter not measuring current drawn

I am following the experiment in the popular electronics book - "Make: Electronics third edition". However, when replicating one of the experiments mentioned in the book (specifically ...
  • 141
0 votes
1 answer
58 views

TXS0108E as bus isolator?

I've been looking for a Bi-directional IO isolator to "unplug" a microcontroller during startup, and found the TXS0108E. My question would be: can you tie VCCA = VCCB = 3.3v? according to ...
0 votes
1 answer
53 views

Improve conceptual intervalometer for rotating potted plants

I'm trying to avoid having my plants tilting or otherwise looking bad after only getting sunlight from one direction. To solve it, I want to make the pots rotate. I'm trying to design a cheap, stand ...
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0 votes
1 answer
76 views

Average lifespan of typical project box LEDs widely available for purchase [closed]

I tried searching for this but I just get light fixture LED information. I'm trying to determine the expected lifespan of a typical small LED like you'll find in electronics kits or hobbyist stores. I ...
3 votes
2 answers
622 views

555 and loudspeaker - Beginner question

First of a disclaimer - I'm a hobbyist and quite the beginner at that, so bear with me. What I'm trying to build is a metronome with an astable 555 oscillator that is driving an 8 Ohm loudspeaker. I ...
  • 39
0 votes
1 answer
84 views

Flywheel/Dynamo behavior under variable load

I have a special effects project in mind where I simulate a bellows and coal fire without, you know, actual fire. My vision thusfar involves rigging a flywheel to a short-stroke lever (the upper arm ...
0 votes
3 answers
318 views

How to delay astable 555 timer IC by ~1 min

My problem: I've reproduced the 555 timer circuit from here: https://www.gadgetronicx.com/door-open-alarm-ic-555/. Because of the specifics of my application I'd like the signal at the speaker to be ...
  • 39
17 votes
4 answers
4k views

How do you store ICs used in hobby electronics?

I've recently started working on a project and I need to find a way to store some ICs that I'm using. I have around five different ICs and someone said I could just put them all together in a small ...
0 votes
2 answers
52 views

How can I use a 5200 mAh Li-Po battery to power multiple things?

I'm building an autonomous car and have a 7.4V 5200mAh 2S Li-Po battery that needs to power the following components: Brushless DC Motor (Through ESC) Raspberry Pi 4 Servo motor Arduino Uno Another ...
1 vote
1 answer
429 views

Is this gate driver circuit sufficient to drive a parallel FET spot welder?

I am building a spot welder for attaching nickel strips to Li-Ion cells to make custom battery packs. There are plenty on the market but I wanted to use up some components and learn something. The ...
0 votes
3 answers
4k views

Can a short circuit kill the USB port of a PC?

I use a cut USB cable as a 5V power supply from my laptop. If the two wires on the other side happen to touch each other, will it kill my USB port? Just to be cautious.
0 votes
2 answers
373 views

Live plant as a touch switch

I’m a Jack of all trades sort of guy but have basically zero electrical knowledge.. That being said.. I want to use a live.. real plant...to turn on and off a light. I tried a touch switch replacement ...
0 votes
1 answer
429 views

Charging 18650 battery with built-in PCb

How would I charge an 18650 battery with a built-in protection circuit? This is for an infrared camera. I normally could charging the device via micro usb but port broke. 4 wires are soldered to the ...
7 votes
6 answers
2k views

When did DC-DC buck converter modules become so popular?

Is it just me or from maybe since 4 years ago every project online for hobbyist electronics is using switch-mode power circuits in them? Looking back 15 years ago at projects from when I started doing ...
3 votes
1 answer
952 views

Which IC component is this?

I seem to have burned out this chip on my Hobby King ESC (see picture). I am not able to read the component part number. The ESC is no longer available to buy. What is the part number (so that I may ...
4 votes
4 answers
942 views

What's the difference between chip families

I've been trying to follow Ben Eater's 8 bit computer design (https://eater.net/8bit) and I've manged to build something that broadly works but it's not very reliable. Sometimes modules don't work, if ...
0 votes
0 answers
72 views

Micro-USB B - female weird pinout

fixing up a kids toy today that used a USB Micro-B cable/port. The female port was smashed up. I have started to remove the old female socket and noticed it did not use a standard pin out. Rather than ...
  • 1
0 votes
1 answer
111 views

Specifications of a motor which will light an led (momentarily) from hand-spinning?

EDIT: I feel I might have placed the emphasis wrongly in my original question so I'll try to revise it here. In the video cited the demonstrator can be seen spinning a small "hobby" motor ...
  • 123
0 votes
3 answers
176 views

Why are the parts more expensive than a Pro Micro? [closed]

I have just started studying electronics and I am having a good time. In the past my experience would have been to use cheap boards, such as the Pro Micro. What I find confusing is that parts, such as ...
0 votes
1 answer
67 views

How does a layman interface with a system on a chip?

I'm looking to build an incredibly simple robot that I control via bluetooth. I've identified the CC2540 from TI which will theoretically allow me to do this. It sounds perfect, it's like 5 bucks. ...
2 votes
2 answers
3k views

How to mount a PCB in a project box

Hi nearly finished my first electronics project and I need to think about how to mount it into a box. I feel like I am missing something absolutely obvious with how to use PCB spacers. Here is a ...
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0 votes
1 answer
33 views

Honeywell TH1100DH1004 - temperature signal

Is it possible to have this (non programmable ) thermostat communicate only a constant temperature reading regardless of what the sensor senses? My understanding is that it communicates a value set ...
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1 vote
4 answers
883 views

Safety: Can I harm myself using an AC, 9V 500mA power supply for experiments?

I'm about to embark on my first electronics project and would like to check off a safety question: I want to build a bicycle hub dynamo -> USB charger based on these instructions. It is basically a ...
  • 13
0 votes
2 answers
283 views

Why is this circuit causing my breaker to trip?

I'm an electronics hobbyist and I decided to make my own electric heater/kiln thingy. It works fine for a couple of minutes, but then the breaker trips. This is my first project involving AC, so I'm a ...
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0 votes
4 answers
499 views

Adjustable Power Supply with LM317

I want to create an adjustable power supply for my electronics projects, and the cheapest/fastest option seems to be using an LM317. However, I do not want to blow things up by doing something wrong (...
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1 vote
4 answers
121 views

What to look for when buying a reliable hobbyist soldering iron

I wanted to buy a soldering iron for some hobby tinkering, ordered one long ago from Wish! For a few quid, but as you must imagine it's awful. Doesn't heat uniformly, overheats and melts plastic. Tips ...
0 votes
2 answers
308 views

Phone on a breadbord

My current electronics project is to build a very simple customizable "phone". It is my own idea, with as ultimate goal to learn about microcontrollers and basic electronics. This is my set-up so far ...
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2 votes
0 answers
180 views

Hobby Project - Signal Frequency detector

Context: I have taken on a little side hobby project to learn by making a circuit which should be able to only go high when it sense an acoustic signal with a frequency around 40kHz. To do this I will ...
2 votes
2 answers
2k views

Bandpass Filter: Single supply op amp design

I have taken on a hobby project and I am trying to make a circuit which would be able to identify an acoustic signal with a frequency of 40kHz. Here is the circuit of a band pass filter for this: ...
0 votes
1 answer
442 views

Should I spread the pads out on the footprint of a THT LED?

I have a 4 pin RGB LED with a common anode. I'm trying to make my first PCB and I am creating the footprint for the LED now. I don't have a datasheet for the LEDs unfortunately. I have a ruler ...
1 vote
2 answers
1k views

Do I need decoupling capacitors when I'm PWMing an LED?

I'm a hobbyist (well, less than a hobbyist really) trying to layout my first PCB design. I'm somewhat familiar with the concept of decoupling capacitors. I'm fading 3 LEDs in and out (really, it's ...
0 votes
1 answer
59 views

using 7.62mm screw terminals on prototype board

What have people done to be able to use 7.62mm screw terminals on prototype boards? I am trying to prototype something use screw terminals that have 7.62mm posts, but the prototype boards do not have ...
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3 votes
3 answers
838 views

Simple, low precision, milliohmmeter

Would like to have a simple milliohmeter for car wiring checking. Precision is not important, it's not about 3 vs 4 mΩ, it's about 3 vs 30 vs 300 mΩ. Simple idea is a 1A floating current source (2 ...
0 votes
2 answers
2k views

Replicate PCB design on stripboard

I'm thinking about making a DIY project (this one). I'm a complete n00b, I just have some theoretical knowledge about electronics from some university courses, and I'd like to learn some more. I was ...
1 vote
3 answers
381 views

Could one actually build electronics without EE degree? [closed]

I understand that a teach yourself electronics book can "teach you electronics", but just how far can that take you developmentally? I want to have the ability to solve a problem requiring the ...
7 votes
7 answers
3k views

Is it cheating if I use an SRAM chip as a register file? [closed]

I'm currently building my very own processor using discrete logic (74LSxx series and that) using my very own instruction set architecture. I am starting to rack up a bit of a bill because all the ...
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2 votes
4 answers
11k views

Power connectors: 2.1mm and 2.5mm, 1.35 and 1.7mm

I refer to DC power connectors used for a wide variety of common consumer devices. I notice that I have to specify between 2.1mm and 2.5mm when I want to purchase these online. Are the two ...
-2 votes
1 answer
68 views

Cupboard lighting problem

I have some battery powered LED lights to go in a cupboard; and I have a 5-terminal magnetic alarm sensor to turn them on when the cupboard door opens. The problem is that the lights turn on when the ...
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0 votes
2 answers
5k views

Calculating current in a series circuit

Given the following circuit, it seems like we could use ohms law to conclude that current = voltage / resistance. With a source voltage of 3.3 and a resistance value of 220, current = 3.3 / 220 = .015 ...
's user avatar
1 vote
1 answer
115 views

Understanding LED specifications (hobby kit)

I have an LED that looks like: It did not come with specs for the LED. In laymens terms, I'm trying to determine the technical term for the following descriptions. (What is the max amount of current ...
's user avatar
0 votes
3 answers
959 views

Digital Rotary Encoder -- Broken? Or am I misunderstanding how it works?

I apologize if this seems like a fundamental question, but I feel like I'm missing a fundamental understanding about digital rotary encoders, because none of my basic encoders are working as expected. ...
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5 votes
5 answers
8k views

What is a good alternative for the UA741 opamp in hobby projects?

Related to What's the uA741's appeal?, a lot of schematics use this rather dated opamp. My follow-up question would be: What is a good alternative? Of course if you have specific requirements ...
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-2 votes
1 answer
105 views

A good way to get into Electronics with just 2 hours per week? [closed]

I want to get into electronics but I only have 2 hours per week to spend time-wise and my budget is low. What are some good projects? Perhaps I should spend my time doing C programming challenges ...